#!/usr/bin/env python __author__ = "bt3" def revert(string): ''' >>> s = 'hello' >>> revert(s) 'olleh' >>> revert('') '' ''' return string[::-1] def reverse_string_inplace(s): ''' >>> s = 'hello' >>> reverse_string_inplace(s) 'olleh' >>> reverse_string_inplace('') '' ''' if s: s = s[-1] + reverse_string_inplace(s[:-1]) return s if __name__ == '__main__': import doctest doctest.testmod()